Immunity Flashcards
1
Q
What are the 4 steps of a pathogen entering the body?
A
Enter the host
Colonise host tissues
Evade host defences
Damage host tissues
2
Q
How is skin a barrier to help with immunity?
A
Tough waterproof outer layer composed of dead skin cells, keratin and oily sebum
3
Q
How are tears and saliva a barrier for microbes?
A
Contains lysozyme - digests bacterial cell walls
4
Q
How is mucus a barrier for microbes?
A
Bacteria becomes trapped in the mucus and are swept away by cilia
5
Q
How is hydrochloric acid a barrier for microbes entering the body?
A
This is found in the stomach and it kills many bacteria, low pH denatures the bacterial enzymes
